Who released powwow 1.2.13b (available at http://mume.org/Download/clients/powwow/), what changes does it contain, who is now the official maintainer and how does one get in touch with him?
The changelog is empty and the news are for 1.2.9.http://hoopajoo.net/projects/powwow.html, which still seems to be the official home, does not mention 1.2.13b at all and the e-mail address to p(Cosmos), the former maintainer who seemingly is responsible for 1.2.13b is invalid ("550 max@linuz.sns.it unknown user account").

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Without actually downloading the archive, my guess is that it would be a snapshot of Dain's powwow development tree (read NEWS 2323 for more info).

As far as I know Steve Slaven (current powwow maintainer) pulled from Dain's git tree, but never got around to actually making a new release. His git tree is available at http://git.hoopajoo.net/projects/powwow.git . Wobbler, maybe you can mail him and ask how the new release is coming along?